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Junit Task Help for checking null in a test case

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Anybody tries to set test cases for this task below:

When the argument passed to the method is null it returns an empty string • When the string has exactly one character the same string is returned When the string is longer then 1 character its nice version is returned. Examples of invert method usage nice.change("x"); // returns "x" // returns in nice.change(null); nice.change("KY"); // return "YK" Requirements • Your task is to implement a suite of tests in JUnit 4 that will test all the possible behaviours of the invert method, as described above. Your suite of tests will be run against multiple (wrong and correct) implementations of invert method.

Your quick feedback would be highly appreciated.
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Welcome to the Ranch!

Please show us what you have tried so far and tell us where you're having difficulty. The people here can help by giving you tips and advice on how to make your tests better but you won't find anyone who will do your work for you.
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